Input interpretation
![tropicamide | molar mass](../image_source/89f72ecd17a7ebf1b28e21a18161ced3.png)
tropicamide | molar mass
Result
![Find the molar mass, M, for tropicamide: M = sum _iN_im_i Plan: • Write the chemical formula and gather atomic masses from the periodic table. • Determine values for N_i and m_i using these items. • Finally, compute the mass. Write the chemical formula: C_17H_20N_2O_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 17 H (hydrogen) | 20 N (nitrogen) | 2 O (oxygen) | 2 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | N_i | m_i/g·mol^(-1) C (carbon) | 17 | 12.011 H (hydrogen) | 20 | 1.008 N (nitrogen) | 2 | 14.007 O (oxygen) | 2 | 15.999 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molar mass, M: Answer: | | | N_i | m_i/g·mol^(-1) | mass/g·mol^(-1) C (carbon) | 17 | 12.011 | 17 × 12.011 = 204.187 H (hydrogen) | 20 | 1.008 | 20 × 1.008 = 20.160 N (nitrogen) | 2 | 14.007 | 2 × 14.007 = 28.014 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 204.187 g/mol + 20.160 g/mol + 28.014 g/mol + 31.998 g/mol = 284.359 g/mol](../image_source/57c9f2a161d5760e7f2acbc436f2ea2e.png)
Find the molar mass, M, for tropicamide: M = sum _iN_im_i Plan: • Write the chemical formula and gather atomic masses from the periodic table. • Determine values for N_i and m_i using these items. • Finally, compute the mass. Write the chemical formula: C_17H_20N_2O_2 Use the chemical formula to count the number of atoms, N_i, for each element: | N_i C (carbon) | 17 H (hydrogen) | 20 N (nitrogen) | 2 O (oxygen) | 2 Look up the atomic mass, m_i, in g·mol^(-1) for each element in the periodic table: | N_i | m_i/g·mol^(-1) C (carbon) | 17 | 12.011 H (hydrogen) | 20 | 1.008 N (nitrogen) | 2 | 14.007 O (oxygen) | 2 | 15.999 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molar mass, M: Answer: | | | N_i | m_i/g·mol^(-1) | mass/g·mol^(-1) C (carbon) | 17 | 12.011 | 17 × 12.011 = 204.187 H (hydrogen) | 20 | 1.008 | 20 × 1.008 = 20.160 N (nitrogen) | 2 | 14.007 | 2 × 14.007 = 28.014 O (oxygen) | 2 | 15.999 | 2 × 15.999 = 31.998 M = 204.187 g/mol + 20.160 g/mol + 28.014 g/mol + 31.998 g/mol = 284.359 g/mol
Unit conversion
![0.28436 kg/mol (kilograms per mole)](../image_source/3a991d500781e3516be9e415d5fe1295.png)
0.28436 kg/mol (kilograms per mole)
Comparisons
![≈ 0.39 × molar mass of fullerene ( ≈ 721 g/mol )](../image_source/f14e12c0acdac9eaaa26dbb99e07e47b.png)
≈ 0.39 × molar mass of fullerene ( ≈ 721 g/mol )
![≈ 1.5 × molar mass of caffeine ( ≈ 194 g/mol )](../image_source/eb8181ee81245e787e6528acdd8da158.png)
≈ 1.5 × molar mass of caffeine ( ≈ 194 g/mol )
![≈ 4.9 × molar mass of sodium chloride ( ≈ 58 g/mol )](../image_source/a8742b7e077a7e921e6f93f00a7bb733.png)
≈ 4.9 × molar mass of sodium chloride ( ≈ 58 g/mol )
Corresponding quantities
![Mass of a molecule m from m = M/N_A: | 4.7×10^-22 grams | 4.7×10^-25 kg (kilograms) | 284 u (unified atomic mass units) | 284 Da (daltons)](../image_source/13e83c061d28b478c2c3f65c45c0e3a7.png)
Mass of a molecule m from m = M/N_A: | 4.7×10^-22 grams | 4.7×10^-25 kg (kilograms) | 284 u (unified atomic mass units) | 284 Da (daltons)
![Relative molecular mass M_r from M_r = M_u/M: | 284](../image_source/c683a8127a8f5e76c548dd7317915a06.png)
Relative molecular mass M_r from M_r = M_u/M: | 284